Question

Javascript code:

function doSomething(v1,v2){ //blah; }  function SomeClass(callbackFunction,callbackFuncParameters(*Array*))={    this.callback = callbackFunction;    this.method = function(){        this.callback(parameters[0],parameters[1])  // *.*    } }  var obj = new SomeClass( doSomething, Array('v1text','v2text') ); 

The problem is if I change function doSomething to

function doSomething(v1,v2,v3){ //blah; } 

I have to change the corresponding line (marked as //*.*) in SomeClass to

this.callback(parameters[0],parameters[1],parameters[2]); 

What can be done to avoid the (*.*) line to be changed no matter how the number of ‘doSomething’ function’s parameters is changed?

Thanks a lot!

Answer 1

You probably want to use the apply method

this.callback.apply(this, parameters); 

The first parameter to apply indicates the value of ‘this’ within the callback and can be set to any value.